R = 50Ω * (1 + 0.00005 1/☌ * 25☌) = 50.0625Ωįor that calculations we can also use Kelvin instead of degree Centigrade temperature, as the difference between temperatures is the thing that matters, not the absolute temperature value. R0 = 50Ω, we can calculate the resistance R after heating or cooling element to other temperature, e.g. Given TCR and information that resistor's initial value in room temperature T0 = 25☌ is equal to e.g. For example, if we have a resistor with TCR equal to 50 ppm/☌, then it means that the resistance won't change more than 0.00005 ohms per ohm per degree Centigrade temperature change (but only in referenced temperature range, check out the element's manual).
This Thermal Coefficient (TCR) defines the change in resistance as a function of the ambient temperature and it's expressed in ppm/☌.
Rmax = 5.2kΩ + 5.2kΩ * 5% = 5.2kΩ + 0.26kΩ = 5.46kΩĪnd that's all! It wasn't so hard, was it? Check out the result with our resistor color code calculator.Ħ band resistor color code is almost like 5 band resistor, but it additionally includes a temperature coefficient band at last position.
Scroll down and find out the formulas, depending on the type of your resistor! For 6 band there's additional ring indicating the temperature coefficient - read more about it in a paragraph dedicated to 6 band resistors. So that's all you need to know about the colors meaning for 4 and 5 band resistor color codes. It's expressed in percentages, and the variation in components resistance is mostly of a statistical nature ( normal distribution): color name 10⁹Ω (gigaohm).Īnd finally, the last band which occurs in all types of resistors - 4, 5 and 6 band - is a tolerance band. You can express the multipliers with prefixes like kilo, mega or giga (kΩ, MΩ, GΩ), but also the scientific notation is used - e.g. Here, color represents the power of 10, by which the number created from previous bands must be multiplied. Then, we have the band called multiplier, and the colors meaning is different: color name It's the color code working for the first 2 or 3 bands from the left side. Every color is a different number: color name The value of the resistance is marked with the colors.
Ok, let's get down to brass tacks: How to read resistor color code? If none of the above appear to help your problem, you can always use a multimeter to tell between two possible resistances - and reading directions.
The first question which usually arises is: how do I know from which end should I start reading my resistor color code? On the tiniest resistors the printed alphanumeric codes would be too small to read, so the color code was developed in the early 1920s. Color bands are an easy and cheap way of indicating the value of an electronic components.